Boiler-cleaning device.



A. THOMAS & E. THOMPSON.

BOILER CLEANING DEVICE.

APPLICATION FILED T11R25, 1909 942,982. Patented Dec. 14. 1909 2 SHEETS-SHEET l.

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A. THOMAS & E. THOMPSON.

BOILER CLEANING DEVICE.

APPLICATION FILED FEB. 25, 1909 942,982. Patented Dec. 14.1909.

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ADOLPH THOMAS AND EDGAR THOMPSON, OF MINNESOTA LAKE, MINNESOTA.

BOILER-CLEANING DEVICE.

Specification of Letters Patent.

Patented Dec. 14, 1909.

Application filed February 25, 1908. Serial No. 480,006.

To all whom it may concern:

Be it known that we, AooLPH THOMAS and EDGAR THOMPSON, citizens of the United States, residing at Minnesota Lake, in the county of Faribault and State of Minnesota, have invented certain new and useful Improvements in Boiler-Cleaning Devices, of which the following is a specification, reference being had to the accompanying drawings.

Our invention relates to improvements in devices for cleaning steam boilers and the like and more particularly to improved means for removing the scale and dirt from a boiler while it is under pressure.

The object of the invention is to provide an appliance or device for removing scale from a boiler ipe capable of being operated while the boiler is under pressure and which will accomplish the removal of the scale in an efficient manner.

\Vith the above and other objects in view the invention comprises certain novelrconstructions, combinations and arrangements of parts hereinafter fully described and claimed and fully illustrated in the accompanying drawings, in which:

Figure 1 is a vertical sectional view through a steam boiler having our improved device mounted for operation therein. Fig. 2 is a sectional view taken on the line 2.2

of Fig. 1. Fig. 3 is an enlarged detail view of an outer pipe. Fig. 4 is an enlarged detail view of an inner pipe, and Fi 5 is a sectional view taken on line 5-5 0 Fig. 1.

Referring tothe accompanying drawings 1 denotes a boiler of the usual type having a front wall 2 and a back or rearwall 3 provided with a ring 3 riveted thereto. A pipe 4 is threaded at its forward end to the ring 3 and exte nds rearwardly through a brick wall 5 of the fire box 6. An outer pipe 7 having a flanged inner end 8 is disposed lengthwise of the boiler, being suitably supported on its forward end by means of a bearing member 9 secured in place by brace rods extending lengthwise of the boiler. The outer pipe 7 is rovided with a series of metal extensions having open lower ends which extend "laterally of said pipe toward the bottom of the boiler and within a short distance thereof so as to suck up dirt and scale'therefrom, said extensions being located around the slots 10 of said outer tube. The rear end tends through pipe 4 and is forme with a of the pi e 7 ex series of longitudinally spaced slots 10 which are located on its lower half. A packing box 11 is positioned on the pipe 7 and against the rear end of the pipe 4 so as to e ectively prevent steam from escaping from the boiler, and a blow off valve 12 is mounted on the pipe 4 adjacent to the packing box 11, and in communimition with the bore of pipe 4.

An elbow 13 is connected to the outer end of the pipe 7 by one of its legs and the remaining leg is provided with a valve 14 whereby water and dirt may be discharged from the boiler. A second pi e 15 having a series of spirally disposed s ots 16 longitudinally spaced thereon and for register with the slots 10 of the pipe 7 is mounted for rotation therein being connected at its forward end by a bolt 17with the flanged end 8 of the ipe 7, and is formed on its rear end with ongitudinally extending slots 18 adapted for the reception of an operating shaft member 19 mounted on the end of an operating shaft 20, suitably journaled in a bearin and held in place by a collar 21. A stu ng box 23 is provided for shaft 20 and on the outer end of 20 a crank 22, whereby the pi e 15 may be rotated within pipe 7. The orwardend of the elbow is provided with a collar 24 secured thereto by a set screw 25, and formed with a depending leg 26 forming a bearing for a worm shaft 27, which shaft is supported at its forward end by a bearin 28 secured on the pipe 4 by an arm 29. crank 30 is mounted on the rear end of the worm shaft 27 and an arm 31 loosely fixed on the pipe 7 and held in place thereon by fixed co lars 32 and .33 is operatively mounted on said shaft, whereby the connected'tubes or lpipes 7 and 15 may be moved longitudinal y of the boiler bottom. The upper end of the elbow 24 is preferably held steam tight by a stufiin box 34. In order to effect the rotation 0 the outer tube 7 a lever 35 is fixed thereon.

B suitably manipulating the tubes 7 and 15 tile scale in the boiler may be loosened and removed by the agitation of the water due to blowing off through the slots 10 and 16 of the outer and inner tubes and the elbow 24, and the valve 14. As the pipe 1o 1s rotated in the pi e 7 the slots 16 of said pipe will successive y cross the slots 10 of t e pipe 7 so that the scale will be removed by successive steps, from the bottom of the boiler. In order to maintain a circulation of steam through the pipe 4 a circulating pipe 36 is connected to the packing box 11 and connected with the top of the boiler.

Having described our invention we desire to secure by Letters Patent:

1. In a device for cleaning boilers, in combination with a boiler, an outer tube rota tahly mounted in the boiler and formed with a series of longitudinally spaced slots, a tube having a series of longitudinally spaced slots spiral y disposed thereon mounted for rotation within the first tube, a lever connected with the first tube for rotating the same, a worm shaft for moving the first and second tube over the boiler bottom, a crank shaft connected with the second tube for rotating the same, and means for connecting the crank shaft to the second tube.

2. In a device for cleaning boilers, in combination with an outer tube having a series of longitudinally spaced slots, means for supporting thewuter tube in a boiler, a leyer mounted on the tube for rotating the same, an arm loosely fixed to the outer tube, a worm shaft for moving the arm, means for supporting the worm shaft, an inner tube mounted within the outer tube and having a series of longitudinally spaced slots spirally disposed thereon and adaptedto successively register with the slots of the outer tube, a crank for rotating the second tube within the first tube and means for supporting the crank.

3. In a device for cleaning boilers, in combination with a boiler, outer and inner tubes extending into the boiler and formed with co-acting openings, the inner tube being rotatably and slidably mounted. means for rotating the outer tube, means for rotating the inner tube, a worm shaft arranged parallel with said tubes, means for rotating said worm shaft, spaced stops upon the outer.

tube and an a rmlloosely arranged on the outer tube between said stops and actuated by said worm shaft.

4. In a device for cleaning boilers, in combination with a boiler, outer and inner tubes extending into the boiler and formed with co-acting openings, the inner tube being rotatable within the outer tubeand the outer tube being rotatably and slidably mounted, means for rotating the outer tube, an elbow arranged on the outer end of the outer tube, a valve controlled discharge pipe projecting from said elbow, the outer end of the inner tube being formed with openings, a shaft rotatably mounted in the elbow and concentric with said tubes, a crank on the outer end of said shaft, a cross member on the inner end of said shaft and arran ed in the openings of the inner tube, where y the latter may e rotated and means for moving the outer tube longitudinally. r

5. In a device of the character described, in combination with a boiler and a furnace wall, a tubular member extending through the furnace wall and havin its inner end in communication with the boiler, a closure for the outer end of said tubular member, a circulating pipe having one end in communication with the upper portion of the boiler and its other end in communication with the outer portion of said tubular member, inner and outer tubes extending through the boiler and through said tubular member, the outer tube having lon 'tudinal series of openings and the inner tu e a spirally arranged series of slots, said inner tube bein rotatable in the outer one and the outer to e being slidably and rotatably'mounted, tubular extensions upon the outer tube and surrounding the openings therein, an'elbow at the outer end of the outer tube, a valve controlled pipe projecting from said elbow, a crank shaft for rotating the inner tube, a lever for rotatin the outer tube, a worm shaft mounted para lel with said tubes, means for rotating the worm shaft and an arm operatively connected with the outer tube and actuated by said worm shaft.

In testimony whereof we hereunto vafiix our signatures in the presence of two witnesses.

ADOLPH THOMAS. EDGAR THOMPSON.

Witnesses E. GATE, PETER KREMER. 

